import axios from 'axios'
import { MessageBox, Message } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'
import qs from 'qs'

// create an axios instance
const service = axios.create({
  baseURL: process.env.VUE_APP_BASE_API, // url = base url + request url
  // withCredentials: true, // send cookies when cross-domain requests
  timeout: 15000 // request timeout
})

// 请求时拦截
service.interceptors.request.use(
  config => {
    if (store.getters.token) {
    //读取token并添加到header头部
      config.headers['token'] = getToken()
    }
    return config
  },
  error => {
    // do something with request error
    return Promise.reject(error)
  }
)

//响应时拦截
service.interceptors.response.use(
  response => {
    const res = response.data
    if (res.code !== 200) {
      Message({
        message: res.msg || 'Error',
        type: 'error',
        duration: 5 * 1000
      })

      // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
      if (res.code === 50008 || res.code === 50012 || res.code === 50014) {
        // to re-login
        MessageBox.confirm('用户信息过期，请重新登录', '系统提示', {
          confirmButtonText: '登录',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          store.dispatch('user/resetToken').then(() => {
            location.reload()
          })
        })
      }
      return Promise.reject(new Error(res.msg || 'Error'))
    } else {
      return res
    }
  },
  error => {
    console.log('err' + error) // for debug
    Message({
      message: error.msg,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)

//请求方法
const http = {
  post(url,params){
    return service.post(url,params,{
      transformRequest:[(params)=>{
        return JSON.stringify(params)
      }],
      headers:{
        'Content-Type':'application/json'
      }
    })
  },
  put(url,params){
    return service.put(url,params,{
      transformRequest:[(params)=>{
        return JSON.stringify(params)
      }],
      headers:{
        'Content-Type':'application/json'
      }
    })
  },
  get(url,params){
    return service.get(url,{
      params:params,
      paramsSerializer:(params) => {
        return qs.stringify(params);
      }
    })
  },
  //rest风格get请求
  getRestApi(url,params){
    let _params;
    if(Object.is(params,undefined||null)){
      _params = '';
    }else{
      _params = '/'
      for(const key in params){
        if(params.hasOwnProperty(key)&&params[key]!==null&&params[key]!==''){
          _params += `${params[key]}`
        }
      }
      //_params = _params.substr(0,_params.length-1);//这句有待商榷，已经拼好路径参数后又再截取第一个字符，如本来已经拼好“/2”最后又只截取“/”
      if(_params){
        return service.get(`${url}${_params}`)
      }else{
        return service.get(url);
      }
    }
  },
  delete(url,params){
    let _params;
    if(Object.is(params,undefined||null)){
      _params = '';
    }else{
      _params = '/'
      for(const key in params){
        if(params.hasOwnProperty(key)&&params[key]!==null&&params[key]!==''){
          _params += `${params[key]}`
        }
      }
      _params = _params.substr(0,_params.length);//这句有待商榷，已经拼好路径参数后又再截取第一个字符，如本来已经拼好“/2”最后又只截取“/”
      if(_params){
        return service.delete(`${url}${_params}`).catch(err=>{
          Message.error(err.message)
          return Promise.reject(err);
        })
      }else{
        return service.delete(url).catch(err=>{
          Message.error(err.message);
          return Promise.reject(err);
        })
      }
    }
  },
  upload(url,params){
    return service.post(url,params,{
      headers:{'Content-Type':'multipart/form-data'}
    })
  },
  login(url,params){
    return service.post(url,params,{
      transformRequest:[(params)=>{
        return qs.stringify(params)
      }],
      headers:{'Content-Type':'application/x-www-form-urlencoded'}
    })
  }
}
export default http
